Improvement in sewer-gas traps



B. F. UNDERWOOD.

SEWER GAST RAP.

Patented 31113218, 1876.

lie/179,881.

In 71672 Ear TVZ' blesses:

xterm PHOTO-mm WASHINGTON, D. C.

UNITED STATES PATENT OFFIoE;

BENONI UNDERVVOOD, OF BROOKLYN, NEW YORK, ASSIGNOR TO O. TITUS THAYER, OF SAME PLACE.

IMPROVEMENT IN SEWER-GAS TRAPS.

Specification forming part of Letters Patent No. 179,881, dated July 18, 1876; application filed February 18, 1876. 4

To all whom it may concern Be it known that I, BENONI F. UNDER.- WOOD,0f the cityot' Brooklymcounty of Kings and State of New York, have invented a new and useful Improvement in Valve-Traps, \vh ieh improvement is fully set forth in the following specification, reference being had to the accompanying drawing.

The objectof my invention is the construction of a valve-trap fitted with a ball-valve -i'or the prevention of the return of sewer-gas,

which valve will so act as to give an unobstructed passage of the full capacity of the trap.

This trap consists of a descending pipe, A, making a short curve and ascending an inch or more of the same diameter B, then obliquely enlarging to produce a slightly greater diameter, O, then extending upward of the increased diameter to a height equal to one and at halftime the diameter,'the end being closed by a screw-plug, having an oval opening enlargement, an upward extension having an oval opening placed within and above the oblique portion of the pipe for the outlet of said trap, substantially as shown and described.

BENONI F. UNDERWOOD.

Witnesses:

WVALTER HUTTON, L. E. W001). 

